\section{左右同形适其中}
\setcounter{tuxxx}{0}%图编号从1开始
{\heiti 题解}：左右同形的话下在中间较合适，这是对己方而言；如果对攻击对方来说也可叫``左右同形击其中''。\par
\begin{psgopartialboard*}{(1,1)(19,6)}
	%1
	\markpos{A}{k}{4}

	\stone{black}{d}{4}
	\stone{black}{q}{4}	

	\setcounter{gomove}{0}%步数编号从1开始
	\move{k}{3}%1

\end{psgopartialboard*}\par
\tx ：黑1或A位，都是符合左右同形适其中的。这样不偏不倚，两边都照顾到了。\par
\begin{psgopartialboard*}{(1,1)(7,6)}
	%2
	\stone{black}{a}{2}
	\stone{black}{b}{2}	
	\stone{black}{c}{2}
	\stone{black}{d}{1}
	\stone{black}{d}{2}

	\stone{white}{a}{3}
	\stone{white}{b}{3}
	\stone{white}{c}{3}
	\stone{white}{d}{3}
	\stone{white}{e}{1}
	\stone{white}{e}{2}
	\stone{white}{e}{3}

	\setcounter{gomove}{0}%步数编号从1开始
	\move{b}{1}%1

\end{psgopartialboard*}\par
\tx ：黑1从中间补活，读者也许觉得太简单了，但它却是要诀的缩影。如果白方下，也是在1位一击。其实棋中许多道理，都是从这类最基本的地方开始的。\par
{\heiti 理由}：在很多型中，左右同形正中之点是好点，它取左右对称之意，能保证两边好点必得其一，这是一种意思；另一种意思是正中一击使对方左右受敌。\par
\begin{psgopartialboard*}{(1,1)(19,6)}
	%3
	\markpos{A}{h}{3}
	\markpos{B}{o}{3}

	\stone{black}{d}{4}
	\stone{black}{q}{4}	

	\setcounter{gomove}{0}%步数编号从1开始
	\pass*
	\move{k}{3}%1
	\move{m}{3}%2
	\move{f}{3}%3

\end{psgopartialboard*}\par
\tx （左右逢源）：白1分投，左右逢源，黑2则白3，黑A则白B，大同小异，白1利于防守。\par
\begin{psgopartialboard*}{(1,1)(19,6)}
	%4

	\stone{black}{d}{4}
	\stone{black}{q}{4}	

	\setcounter{gomove}{0}%步数编号从1开始
	\pass*
	\move{j}{3}%1
	\move{l}{3}%2
	\move{f}{3}%3
	\move{e}{3}%4
	\move{f}{4}%5
	\move{d}{6}%6

\end{psgopartialboard*}\par
\tx （局促）：白1同样分投，被黑2从宽的一边拦，白3后，黑4尖顶，白顿时呈局促之形。\par
\begin{psgopartialboard*}{(1,1)(9,6)}
	%5
	\markpos{A}{e}{2}
	\markpos{B}{g}{2}

	\stone{black}{c}{2}
	\stone{black}{c}{4}	
	\stone{black}{c}{6}
	\stone{black}{d}{3}
	\stone{black}{h}{3}
	\stone{black}{h}{4}
	\stone{black}{j}{2}
	
	\stone{white}{d}{2}
	\stone{white}{e}{3}
	\stone{white}{e}{4}
	\stone{white}{g}{3}
	\stone{white}{h}{2}

	\setcounter{gomove}{0}%步数编号从1开始
	\move{f}{2}%1

\end{psgopartialboard*}\par
\tx （击中）：对于这样的白棋，在1位击是最有力的，今后黑A、B两点必得其一，白眼位被破，陷于困境。\par
\begin{psgopartialboard*}{(1,1)(9,6)}
	%6
	\stone{black}{c}{2}
	\stone{black}{c}{4}	
	\stone{black}{c}{6}
	\stone{black}{d}{3}
	\stone{black}{h}{3}
	\stone{black}{h}{4}
	\stone{black}{j}{2}
	
	\stone{white}{d}{2}
	\stone{white}{e}{3}
	\stone{white}{e}{4}
	\stone{white}{g}{3}
	\stone{white}{h}{2}
	
	\setcounter{gomove}{0}%步数编号从1开始
	\move{e}{2}%1
	\move{f}{2}%2
	\move{d}{1}%3

\end{psgopartialboard*}\par
\tx （帮忙）：黑1打，虽然也是扎实的大官子，但白处在相当危险的情况下，这样下就帮白的忙了，白比较容易做活。如果白方先走，也是在2位虎。这是攻守的要点。\par
{\heiti 运用}：本要诀可用于己方得好形或补活，也可用于攻击或杀死对方。\par
\begin{psgopartialboard*}{(1,1)(9,6)}
	%7
	\stone{black}{c}{2}
	\stone{black}{c}{3}	
	\stone{black}{d}{4}
	\stone{black}{e}{2}
	\stone{black}{e}{3}
	\stone{black}{e}{4}
	\stone{black}{f}{4}
	\stone{black}{g}{2}
	\stone{black}{g}{3}
	
	\stone{white}{b}{2}
	\stone{white}{b}{3}
	\stone{white}{b}{4}
	\stone{white}{c}{1}
	\stone{white}{c}{4}
	\stone{white}{d}{5}
	\stone{white}{e}{5}
	\stone{white}{f}{5}
	\stone{white}{g}{1}
	\stone{white}{g}{4}
	\stone{white}{h}{2}
	\stone{white}{h}{3}
	\stone{white}{h}{4}

\end{psgopartialboard*}\par
\tx （习题）：请运用要诀，补活这块黑棋。\par
\begin{psgopartialboard*}{(1,1)(9,6)}
	%8
	\stone{black}{c}{2}
	\stone{black}{c}{3}	
	\stone{black}{d}{4}
	\stone{black}{e}{2}
	\stone{black}{e}{3}
	\stone{black}{e}{4}
	\stone{black}{f}{4}
	\stone{black}{g}{2}
	\stone{black}{g}{3}
	
	\stone{white}{b}{2}
	\stone{white}{b}{3}
	\stone{white}{b}{4}
	\stone{white}{c}{1}
	\stone{white}{c}{4}
	\stone{white}{d}{5}
	\stone{white}{e}{5}
	\stone{white}{f}{5}
	\stone{white}{g}{1}
	\stone{white}{g}{4}
	\stone{white}{h}{2}
	\stone{white}{h}{3}
	\stone{white}{h}{4}
	
	\setcounter{gomove}{0}%步数编号从1开始
	\move{e}{1}%1
	\move{f}{2}%2
	\move{f}{3}%3
	\move{d}{2}%4
	\move{d}{3}%5

\end{psgopartialboard*}\par
\tx （正解）：黑1立是唯一做活的办法，这样确保了左右的眼位。\par
\begin{psgopartialboard*}{(1,1)(9,6)}
	%9
	\stone{black}{c}{2}
	\stone{black}{c}{3}	
	\stone{black}{d}{4}
	\stone{black}{e}{2}
	\stone{black}{e}{3}
	\stone{black}{e}{4}
	\stone{black}{f}{4}
	\stone{black}{g}{2}
	\stone{black}{g}{3}
	
	\stone{white}{b}{2}
	\stone{white}{b}{3}
	\stone{white}{b}{4}
	\stone{white}{c}{1}
	\stone{white}{c}{4}
	\stone{white}{d}{5}
	\stone{white}{e}{5}
	\stone{white}{f}{5}
	\stone{white}{g}{1}
	\stone{white}{g}{4}
	\stone{white}{h}{2}
	\stone{white}{h}{3}
	\stone{white}{h}{4}
	
	\setcounter{gomove}{0}%步数编号从1开始
	\move{f}{1}%1
	\move{d}{2}%2
	\move{d}{3}%3
	\move{d}{1}%4

\end{psgopartialboard*}\par
\tx （被杀）：黑1不走中间，一方的眼被破。黑1走4位也一样被杀。\par
\begin{psgopartialboard*}{(1,1)(9,8)}
	%10
	\stone{black}{c}{4}
	\stone{black}{c}{6}	
	\stone{black}{d}{3}
	\stone{black}{g}{7}
	\stone{black}{h}{3}
	\stone{black}{j}{4}
	\stone{black}{j}{6}

	\stone{white}{e}{3}
	\stone{white}{e}{4}
	\stone{white}{g}{3}
	\stone{white}{g}{5}
	
\end{psgopartialboard*}\par
\tx （习题）：白四子应怎样补活？\par
\begin{psgopartialboard*}{(1,1)(9,9)}
	%11
	\markpos{A}{d}{2}
	\markpos{B}{h}{2}

	\stone{black}{c}{4}
	\stone{black}{c}{6}	
	\stone{black}{d}{3}
	\stone{black}{g}{7}
	\stone{black}{h}{3}
	\stone{black}{j}{4}
	\stone{black}{j}{6}
	
	\stone{white}{e}{3}
	\stone{white}{e}{4}
	\stone{white}{g}{3}
	\stone{white}{g}{5}
	
	\setcounter{gomove}{0}%步数编号从1开始
	\pass*
	\move{f}{2}%1

\end{psgopartialboard*}\par
\tx ：白1按要诀补活，干净利落，以后A、B两点做眼，必得其一。\par
\begin{psgopartialboard*}{(1,1)(9,9)}
	%12
	\stone{black}{c}{4}
	\stone{black}{c}{6}	
	\stone{black}{d}{3}
	\stone{black}{g}{7}
	\stone{black}{h}{3}
	\stone{black}{j}{4}
	\stone{black}{j}{6}
	
	\stone{white}{e}{3}
	\stone{white}{e}{4}
	\stone{white}{g}{3}
	\stone{white}{g}{5}
	
	\setcounter{gomove}{0}%步数编号从1开始
	\pass*
	\move{d}{2}%1
	\move{c}{2}%2
	\move{f}{2}%3
	\move{d}{1}%4

\end{psgopartialboard*}\par
\tx ：白1扳则不好，这时不但要担被黑直接在3位点的风险，即使如图结果，黑4打后，白反不如上图。\par
\begin{psgopartialboard*}{(1,1)(7,6)}
	%13
	\stone{black}{c}{3}
	\stone{black}{c}{4}	
	\stone{black}{c}{5}
	\stone{black}{d}{6}
	
	\stone{white}{d}{3}
	\stone{white}{d}{4}
	\stone{white}{d}{5}

\end{psgopartialboard*}\par
\tx （习题）：这样的形，白方本当补棋，但如果不补，怎样攻击最有力呢？\par
\begin{psgopartialboard*}{(1,1)(7,7)}
	%14
	\markpos{A}{f}{3}
	\markpos{B}{g}{3}

	\stone{black}{c}{3}
	\stone{black}{c}{4}	
	\stone{black}{c}{5}
	\stone{black}{d}{6}
	
	\stone{white}{d}{3}
	\stone{white}{d}{4}
	\stone{white}{d}{5}
	
	\setcounter{gomove}{0}%步数编号从1开始
	\move{f}{4}%1
	\move{f}{5}%2
	\move{e}{5}%3

\end{psgopartialboard*}\par
\tx （要点）：黑1击中要害，这样的形叫``三子击其中''。白如2压，黑3挖有力。白如3位曲，甚为委曲。又白如A托，黑B扳，白亦难走。\par
\begin{psgopartialboard*}{(1,1)(7,7)}
	%15
	\stone{black}{c}{3}
	\stone{black}{c}{4}	
	\stone{black}{c}{5}
	\stone{black}{d}{6}
	
	\stone{white}{d}{3}
	\stone{white}{d}{4}
	\stone{white}{d}{5}
	
	\setcounter{gomove}{0}%步数编号从1开始
	\move{f}{3}%1
	\move{f}{4}%2
	\move{g}{4}%3
	\move{e}{6}%4
	\move{d}{7}%5
	\move{g}{5}%6
	\move{f}{5}%7
	\move{f}{6}%8
	\move{e}{4}%9
	\move{e}{5}%10

\end{psgopartialboard*}\par
\tx （击，不中）：黑1虽也是好点，但不如2位严厉，因为白2压后，总可以腾挪的。至于黑1于7位，白于1位，白就更容易谋活了。\par
``三子击其中''在对局中是经常会遇到的。\par
\begin{psgopartialboard*}{(1,1)(10,10)}
	%16
	\markpos{A}{k}{4}
	\markpos{B}{j}{4}
	\markpos{C}{h}{4}

	\stone{black}{b}{6}
	\stone{black}{b}{7}	
	\stone{black}{c}{3}
	\stone{black}{c}{4}
	\stone{black}{c}{5}
	\stone{black}{f}{3}
	\stone{black}{f}{4}
	\stone{black}{f}{5}
	
	\stone{white}{c}{6}
	\stone{white}{c}{7}
	\stone{white}{c}{9}
	\stone{white}{d}{2}
	\stone{white}{d}{3}
	\stone{white}{e}{4}
	\stone{white}{e}{5}
	\stone{white}{e}{6}

	\stone[\marktr]{white}{g}{7}

\end{psgopartialboard*}\par
\tx ：这是常见的一间反夹定式，白\stone[\marktr]{white}飞时，黑总是要在A或B位补一手，就是怕白在C位攻击的意思。\par
\begin{psgopartialboard*}{(1,1)(8,7)}
	%17
	\stone{black}{c}{3}
	\stone{black}{c}{4}	
	\stone{black}{c}{5}
	\stone{black}{c}{6}

	\stone{white}{d}{3}
	\stone{white}{d}{4}
	\stone{white}{d}{5}
	\stone{white}{e}{7}

	\setcounter{gomove}{0}%步数编号从1开始
	\move{h}{4}%1
	\move{f}{4}%2

\end{psgopartialboard*}\par
\tx ：如果是这样的形，白虽有了飞已经出头，但黑1时，白2仍是整形的要点。以上两图可以反证要诀的重要，这样的棋形也是常见的。\par
\begin{psgopartialboard*}{(1,1)(6,7)}
	%18
	\markpos{A}{d}{3}
	\markpos{B}{b}{5}
	\markpos{C}{c}{4}
	
	\stone{black}{a}{2}
	\stone{black}{b}{1}	
	\stone{black}{b}{2}
	
	\stone{white}{b}{4}
	\stone{white}{d}{2}
	\stone{white}{d}{4}

	\setcounter{gomove}{0}%步数编号从1开始
	\move{c}{3}%1
	\move{e}{5}%2

\end{psgopartialboard*}\par
\tx （趣味）：这是著名的古试题``三仙出洞''。黑1、白2这两步棋都是``左右同形适其中''的典型，是值得玩味的。\par
白2如A粘，黑B靠即逸出。白如C粘也是同样结果。\par
\begin{psgopartialboard*}{(1,1)(7,7)}
	%19
	\stone{black}{a}{2}
	\stone{black}{b}{1}	
	\stone{black}{b}{2}
	\stone{black}{c}{3}

	\stone{white}{b}{4}
	\stone{white}{d}{2}
	\stone{white}{d}{4}
	\stone{white}{e}{5}

	\setcounter{gomove}{0}%步数编号从1开始
	\move{e}{2}%1
	\move{d}{3}%2
	\move{d}{1}%3
	\move{f}{2}%4
	\move{b}{5}%5
	\move{c}{4}%6
	\move{a}{4}%7
	\move{b}{6}%8
	\move{g}{2}%9
	\move{e}{3}%10
	\move{b}{7}%11
	\move{c}{5}%12
	\move{a}{6}%13
	\move{a}{5}%14
	\move{f}{1}%15
	\move{e}{1}%16

\end{psgopartialboard*}\par
\tx （续前图）：前图以后，黑1到16形成两劫连环。黑采用左右同形适其中的办法突出重围。\par
前图黑1是击其中的好手，白2在中间应也是最强的抵抗。本题是趣味性的，因此不可分析得失。\par
\begin{psgopartialboard*}{(1,1)(19,13)}
	%20
	\stone{black}{j}{3}
	\stone{black}{j}{4}	
	\stone{black}{k}{3}
	\stone{black}{l}{3}
	\stone{black}{l}{4}

	\stone{white}{h}{3}
	\stone{white}{h}{5}
	\stone{white}{j}{2}
	\stone{white}{k}{2}
	\stone{white}{k}{5}
	\stone{white}{k}{6}
	\stone{white}{l}{2}
	\stone{white}{m}{3}
	\stone{white}{m}{5}

\end{psgopartialboard*}\par
\tx ：这也是著名的古试题。黑先，如何得以脱出？\par
并不难解，棋图结构奇特，着法饶有趣味，留给读者自己去解答吧。\par
{\heiti 区别}：在左右不同形时，这条要诀就不适用，需要加以区别。\par
\begin{psgopartialboard*}{(1,1)(11,7)}
	%21
	\markpos{A}{g}{3}

	\stone{black}{e}{3}
	\stone{black}{e}{4}	
	\stone{black}{e}{5}

	\stone{white}{b}{4}
	\stone{white}{c}{3}
	\stone{white}{d}{4}
	\stone{white}{d}{5}
	\stone{white}{d}{6}
	\stone{white}{l}{4}

	\stone[\marktr]{black}{d}{3}

	\setcounter{gomove}{0}%步数编号从1开始
	\pass*
	\move{g}{4}%1
	\move{g}{2}%2

\end{psgopartialboard*}\par
\tx （不同形）：现在黑方多了\stone[\marktr]{black}一子就不是同形了。白1仍击其中，黑2飞有了眼形，白不成功。正着应当在A位搜根，采用``制孤''战术，而不应用击其中的严厉攻法。\par
\begin{psgopartialboard*}{(1,1)(11,7)}
	%22	
	\stone{black}{e}{3}
	\stone{black}{e}{4}	
	\stone{black}{e}{5}

	\stone{white}{d}{3}
	\stone{white}{d}{4}
	\stone{white}{d}{5}
	\stone{white}{d}{6}
	\stone{white}{l}{4}

	\setcounter{gomove}{0}%步数编号从1开始
	\pass*
	\move{g}{4}%1
	\move{g}{2}%2
	\move{e}{2}%3
	\move{f}{2}%4
	\move{d}{2}%5

\end{psgopartialboard*}\par
\tx （辨别）：如果在本图情况，白1严厉，黑2如仍飞，白3扳、5粘后，黑形很坏。\par
{\heiti 小结}：本要诀用后较激烈，但必须看清是否同形，如果不是同形，下法须细察。\par
\clearpage
